Romesco is a pungent, piquant and powerful flavour bomb that transforms even mundane meals into really tasty ones, and it’s made simply by upcycling an old pepper, tomato and piece of stale bread into a certified Catalan delicacy. My first head chef cooked mainly Spanish and Moorish-inspired food, and working with him had a profound impact on my life. It’s one reason I now love to cook colourful, rustic and flavourful food that draws on traditional cultures to create thrifty and nutritious dishes which make the most of a particular ingredient. This kind of old peasant cookery has the added benefit of supporting personal and planetary health, too.